Remove use of ? operator

BUG=
R=kevmoo@j832.com

Review URL: https://chromiumcodereview.appspot.com/17967002
Fix show_hide code to eliminate Jank due to using a fixed max-height of 500px and due to starting reversed animations at the beginning rather than at the appropriate point to match the progress of the previously running animation. Modify modal styling so that the background fade in animation is controlled by CSS as is the case for regular Bootstrap widgets.

BUG=
R=kevmoo@j832.com

Review URL: https://chromiumcodereview.appspot.com/17965002
work-around Dart SDK 11570

https://code.google.com/p/dart/issues/detail?id=11570
Weird behavior in Css3TransitionEffect with dart2js
default all collapse elements in accordion demo to be...collapsed
dart2js + copy components
Merge pull request #2 from kevmoo/master

work-around for 11570, {{ }} in demo output, dart2js
updated widgets
Updated CSS
Updated to new css access in web_ui
Changed to use nested rulesets
cleanup
merged
Integrated CL suggestions
Integrated CL suggestions
Used latest template compiler
merged